1, tap water disinfection
Tap water is generally disinfected with chlorine gas, and about 0.002g chlorine gas is introduced into 1L water. The principle of disinfection is to react with water to produce hypochlorous acid, which has strong oxidation performance to kill bacteria in water.
The reason why hypochlorous acid is not directly used for disinfection of tap water is that hypochlorous acid is easy to decompose, difficult to store, high in cost and toxic. Chlorine disinfection can balance the dissolution, decomposition and synthesis of hypochlorous acid in water, with appropriate concentration and less residual toxicity in water.
2, used for brewery sewage treatment.
China patent discloses the method of treating beer wastewater with chlorine. Chlorine is a commonly used disinfectant in water supply companies, with low price, low dosage, reliable disinfection and mature technology. Chlorine can also deodorize and remove microorganisms, and the removal rate of biological oxygen consumption and chemical oxygen consumption is also high, which can ensure the stability of recycled water quality, so it is more suitable for brewery sewage treatment.
3. Removing sulfur and phosphorus impurities from acetylene.
Acetylene gas is the main raw material for PVC production. In industrial acetylene gas, sulfur and phosphorus exist in the form of H2S and H3P. If these two gases exceed the standard, the catalyst used in PVC production will be poisoned. Using the strong oxidation of C 10- in chlorine water, acetylene gas can be sprayed and washed to remove H2S and H3P.
4. Preparation of nanocrystalline cellulose by oxidative degradation of chlorine.
China patent discloses a method for preparing nano microcrystalline cellulose by oxidative degradation of chlorine. Compared with the method of preparing nano-microcrystalline cellulose by hydrolysis, the method of chlorine oxidative degradation makes the nano-microcrystalline cellulose bright and white by using the bleaching effect of sodium hypochlorite produced by chlorine hydrolysis.
Step 5 make bleach
There are many bleaching agents made of chlorine, and there are two in general life, NaClO and Ca(ClO)2. Generally speaking, the disinfectant is NaClO, which is usually made by introducing chlorine into sodium hydroxide. But its price is higher, and it is not used for industrial bleaching, which is common in 84 years.
Disinfecting powder is Ca(ClO)2, which is generally solid because it is unstable. It is made by introducing chlorine into lime milk, and its price is low. It is used for industrial bleaching. The use method is to add water to dissolve the active ingredient calcium hypochlorite, thus bleaching.
When storing the above bleach, pay attention to sealing and drying, and avoid direct sunlight. Because hypochlorous acid will react with carbon dioxide and water in the air to generate hypochlorous acid, hypochlorous acid will decompose under light, leading to bleach failure.